1 // 2 // Copyright (c) SAS Institute Inc. 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 package x509tools 18 19 import ( 20 "crypto/tls" 21 "fmt" 22 "os" 23 ) 24 25 // If the SSLKEYLOGFILE environment variable is set, then open it for appending 26 // and write TLS master secrets there in the "NSS Key Log Format". Use this for 27 // debugging TLS and HTTP problems with Wireshark. 28 func SetKeyLogFile(tconf *tls.Config) { 29 if klf := os.Getenv("SSLKEYLOGFILE"); klf != "" { 30 fmt.Fprintln(os.Stderr, "WARNING: SSLKEYLOGFILE is set! TLS master secrets will be logged.") 31 f, err := os.OpenFile(klf, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0600) 32 if err != nil { 33 panic(err) 34 } 35 tconf.KeyLogWriter = f 36 } 37 } 38